[PATCH] git-gui: fix use of undeclared variable diff_empty_count

[Joerg Bornemann <joerg.bornemann@web.de>]

Commit 584fa9cc introduced the global variable diff_empty_count, which
is used in diff.tcl. This variable wasn't declared anywhere which
resulted in an ugly error message box instead of the intended
informative message.

Signed-off-by: Joerg Bornemann <joerg.bornemann@web.de>
---
  git-gui.sh |    1 +
  1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/git-gui.sh b/git-gui.sh
index e4a9230..46b056f 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -1131,6 +1131,7 @@ set current_diff_path {}
  set is_3way_diff 0
  set is_conflict_diff 0
  set selected_commit_type new
+set diff_empty_count 0

  set nullid "0000000000000000000000000000000000000000"
  set nullid2 "0000000000000000000000000000000000000001"
--
1.6.0.2.1172.ga5ed0